Pack Carburizing Study Of Low(Mild) Carbon Steel Through Activated Carbon
The objectives of this research are to conduct a study on the effect of pack carburizing process through activated carbon with varying time and temperature on properties of the low carbon steel sample. The properties are represented by the results of Vickers hardness testing and also the Scanning...
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| Format: | Final Year Project Report |
| Language: | English English |
| Published: |
Universiti Malaysia Sarawak, (UNIMAS)
2019
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/37128/1/Maureen%20%2824pgs%29.pdf http://ir.unimas.my/id/eprint/37128/4/Maureen%20%28fulltext%29.pdf http://ir.unimas.my/id/eprint/37128/ |
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| Summary: | The objectives of this research are to conduct a study on the effect of pack
carburizing process through activated carbon with varying time and temperature on
properties of the low carbon steel sample. The properties are represented by the results
of Vickers hardness testing and also the Scanning Electron Microscopy (SEM) images
of the microstructure. The surface hardness of the control sample was 121 Hv. The
SEM image shows the presence of pearlite which contains both ferrite and cementite.
The carburizing process was conducted in three different temperatures of 850, 900 and
9509C. At each temperature, three samples were held at different carburizing times of
60, 120 and 240 minutes respectively. Once the carburizing process was accomplished,
the sample was again been heated above the austenite temperature and rapidly quenched
into the water bath. From the quenching process, the result shows that the sample which
has been carburized at 950C and held for 240 minutes produced the highest surface
hardness of 736 Hv. From the SEM images, this sample shows the highest amount of
martensite (hard and brittle microstructure) was formed on its surface. All of the
quenched samples then were further tempered at 550C and held for 60 minutes to
reduce the brittleness. From the tempering process, the same samples produced the
highest surface hardness of 411 Hv. The SEM image shows the formation of tempered
martensite along with a sparsely distributed ferrite matrix. In addition, all of the results
obtained was indicated a reduction in the surface hardness of all carburized tempered
samples. However, the final surface hardness of all carburized samples is higher than
the control sample ( 121 Hv). |
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